Tuesday, November 18, 2008, 11:00 am — Small Seminar Room, Bldg. 510
We study the beam-energy and system-size dependence of phi meson production in the STAR experiment at RHIC. At a given beam energy, the transverse momentum distributions for phi mesons are observed to be similar in yield and shape for Cu+Cu and Au+Au colliding systems with similar average numbers of participating nucleons. The phi meson yields in nucleus-nucleus collisions, normalized by the average number of participating nucleons, are found to be enhanced relative to those from p+p collisions with a different trend compared to strange baryons. The enhancement for phi mesons is observed to be higher at sqrt(sNN) = 200 GeV compared to 62.4 GeV. These observations for the produced phi mesons clearly suggest that, at these collision energies, the source of enhancement of strange hadrons is related to the formation of a dense partonic medium in high energy nucleus-nucleus collisions and cannot be solely due to canonical suppression of their production in smaller systems.
Hosted by: Jeffery Mitchell
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